One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10)(11,14)(12,16)(13,15)(19,27)(24,29)(28,32)(30,31) involution — undirected(2,6)(7,8)(9,11,13,12)(10,14,15,16)(18,23)(20,26)(21,25)(24,32)(28,29)(30,31)(1,3,5,4)(2,7,6,8)(10,15)(14,16)(17,18,22,26)(19,28,27,32)(20,25,23,21)(24,31,29,30)(9,12,13,11)(10,16,15,14)(17,19,22,27)(18,24,26,29)(20,28,23,32)(21,31,25,30)(1,4,5,3)(2,8,6,7)(17,20)(18,25)(19,29)(21,26)(22,23)(24,27)(28,30)(31,32)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.